SH7262 datasheet(21/45 Pages) RENESAS

21 / 45 page

SH7262/SH7264 Group

High-speed Read/Write Serial Flash Memory

Using the Renesas Serial Peripheral Interface

REJ06B0889-0100/Rev.1.00

June 2009

Page 21 of 45

3.3

Sample Program Listing "main.c" (3/3)

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/* ==== Chip erase (2 MB, it takes about 10 seconds to complete) ==== */

sf_chip_erase();

/* ==== Writes data (2 MB, it takes about 10 seconds to complete) ==== */

addr = TOP_ADDRESS;

for(i = 0; i < SF_NUM_OF_SECTOR; i++){

/* ---- Initializes the data (64 KB) ---- */

for(j = 0; j < SF_SECTOR_SIZE; j++){

data[j] = (i + j) % 100;

}

/* ---- Writes one sector (64 KB) data ---- */

for(j = 0; j < ( SF_SECTOR_SIZE / SF_PAGE_SIZE ); j++){

/* ---- Writes one page (256 bytes) data ---- */

sf_byte_program( addr, data+(j*SF_PAGE_SIZE), SF_PAGE_SIZE );

addr += SF_PAGE_SIZE;

/* Updates the destination address to write */

}

/* ==== Reads data (2 MB) ==== */

addr = TOP_ADDRESS;

for(i = 0; i < SF_NUM_OF_SECTOR; i++){

/* ---- Reads one sector (64 KB) data ---- */

sf_byte_read_long( addr, rbuf, SF_SECTOR_SIZE );

addr += SF_SECTOR_SIZE;

/* Updates the source address to read */

/* ---- Verifies data ---- */

p = (unsigned char *)rbuf;

for(j = 0; j < SF_SECTOR_SIZE; j++){

data[j] = (i + j) % 100;

/* Outputs the written data */

if( data[j] != *(p+j) ){

puts("Error: verify error\n");

fflush(stdout);

while(1);

}

/* ==== Protects serial flash memory ==== */

sf_protect_ctrl( SF_REQ_PROTECT );

while(1){

/* loop */

}

/* End of File */

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